1. Institute for Health Research, Kaiser Permanente Colorado, Aurora, CO, USA
2. Department of Pediatrics, University of Colorado School of Medicine, Aurora, CO, USA
3. Department of Epidemiology, Colorado School of Public Health, Aurora, CO, USA
4. Center for Population Health Research, University of Montana, Missoula, MT, USA
5. School of Public and Community Health Sciences, University of Montana, Missoula, MT, USA
6. College of Public Health, University of South Florida, Tampa, FL, USA